Metallic core-shell substrate is specially used to serve ultrasensitive molecular detection down to concentration of micromolar level based on surface-enhanced Raman spectroscopy (SERS). Calculations show that the amorphous poly(methyl methacrylate) (PMMA) photonic crystals incorporated with metal nanoparticles which is either gold or silver nanoparticles can significantly increase the electromagnetic fields at the air dielectric interface, leading to remarkable Raman enhancement. Corresponding experiments and characterizations show the characteristic and performance of core-shell structures which present an excellent sensitivity, reproducibility and stability to act as SERS substrate.

中文翻译：

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用于表面增强拉曼散射（SERS）的金属核壳光子晶体

金属核-壳基质特别用于基于表面增强拉曼光谱（SERS）的超灵敏分子检测，直至微摩尔浓度。计算表明，掺有金属纳米颗粒（金或银纳米颗粒）的非晶态聚（甲基丙烯酸甲酯）（PMMA）光子晶体可以显着增加空气介电界面处的电磁场，从而显着提高拉曼强度。相应的实验和表征显示了核-壳结构的特征和性能，其具有出色的灵敏度，可再现性和稳定性，可作为SERS底物。